66278013 has 4 divisors (see below), whose sum is σ = 88370688. Its totient is φ = 44185340.

The previous prime is 66277999. The next prime is 66278057. The reversal of 66278013 is 31087266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66278013 - 2¹⁰ = 66276989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66278813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11046333 + ... + 11046338.

It is an arithmetic number, because the mean of its divisors is an integer number (22092672).

Almost surely, 2^66278013 is an apocalyptic number.

It is an amenable number.

66278013 is a deficient number, since it is larger than the sum of its proper divisors (22092675).

66278013 is a wasteful number, since it uses less digits than its factorization.

66278013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22092674.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 66278013 is about 8141.1309410917. The cubic root of 66278013 is about 404.6906401460.

The spelling of 66278013 in words is "sixty-six million, two hundred seventy-eight thousand, thirteen".